Leona Lewis: 'One More Sleep' Promo on 'Leno'!

Leona Lewis dons a metallic dress while performing on The Tonight Show with Jay Leno on Friday (December 20) in Burbank, Calif.

The 28-year-old English songstress was on the show to promote her new holiday single “One More Sleep.”

PHOTOS: Check out the latest pics of Leona Lewis

The day before, Leona donned a little black dress while attending the season finale of X Factor, which was won by Alex & Sierra.

“So happy for @AlexandSierra3 on winning @TheXFactorUSA huge congrats, can’t wait to see what’s next for you guys!” Leona tweeted after the couple won.

FYI: Leona is wearing a Cathy Hardwick dress.